309S Stainless Steel Plate

Alloy 309S is an austenitic stainless steel that contains higher levels of chrome and nickel. The addition of nickel and chrome provides improved oxidation in temperatures up to 1830°F. 309S is a low carbon version of 309 and is known for being easy to fabricate and weld by most standard methods. It is often used in furnace equipment, annealing boxes, thermowells, and other high-temperature applications.

Alloy 309 (UNS S30900) is an austenitic stainless steel developed for use in high temperature corrosion resistance applications. The alloy resists oxidation up to 1900°F (1038°C) under non-cyclic conditions. Frequent thermal cycling reduces oxidation resistance to approximately 1850°F (1010°C).

Because of its high chromium and low nickel content, Alloy 309 can be utilized in sulfur containing atmospheres up to 1832°F (1000°C). The alloy is not recommended for use in highly carburizing atmospheres since it exhibits only moderate resistance to carbon absorption. Alloy 309 can be utilized in slightly oxidizing, nitriding, cementing and thermal cycling applications, albeit, the maximum service temperature must be reduced.

309S (UNS S30908) is the low carbon version of the alloy. It is utilized for ease of fabrication. 309H (UNS S30909) is a high carbon modification developed for enhanced creep resistance. In most instances the grain size and carbon content of the plate can meet both the 309S and 309H requirements.

1. What is the equivalent grade of 309S stainless steel plate and its key chemical composition?

 Equivalent grades: 1.4828 (EN), X7CrNi23-14 (DIN). Key composition: 22.0-24.0% Cr, 12.0-15.0% Ni, ≤0.08% C, ≤2.0% Mn. High Cr/Ni content enhances high-temp corrosion resistance.

2. What are the main application fields of 309S stainless steel plates?

Widely used in: High-temp furnace parts, heat exchangers, boiler components, chemical reactors, and high-temperature corrosion-resistant structures.

3. What are the common international standards for 309S stainless steel plates?

Main standards: EN 10088-2 (Europe), ASTM A240/A480 (North America), JIS G 4305 (Japan), GB/T 3280 (China, equivalent to 06Cr23Ni13).

4. What are the typical mechanical properties of 309S stainless steel plates (annealed state)?

Tensile strength ≥515 MPa, yield strength ≥205 MPa, elongation ≥40%. Excellent high-temperature strength and ductility.

5. What is the key feature of 309S stainless steel plate and how is it different from 304?

Key feature: Excellent high-temperature oxidation resistance (up to 900℃). Different from 304: Higher Cr/Ni content, better high-temp performance but higher cost.

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